USBMSD class: generic class in order to use all kinds of blocks storage chip. More...

#include <USBMSD.h>

Inheritance diagram for USBMSD:

Public Member Functions
	USBMSD (BlockDevice *bd, bool connect_blocking=true, uint16_t vendor_id=0x0703, uint16_t product_id=0x0104, uint16_t product_release=0x0001)
	Constructor. More...

	USBMSD (USBPhy phy, BlockDevice bd, uint16_t vendor_id, uint16_t product_id, uint16_t product_release)
	Fully featured constructor. More...

virtual	~USBMSD ()
	Destroy this object. More...

bool	connect ()
	Connect the USB MSD device. More...

void	disconnect ()
	Disconnect the USB MSD device. More...

void	process ()
	Perform USB processing. More...

void	attach (mbed::Callback< void()> cb)
	Called when USBMSD needs to perform processing. More...

bool	media_removed ()
	Check if MSD device was removed/unmounted on the host side. More...

void	init ()
	Initialize this instance. More...

void	deinit ()
	Power down this instance. More...

bool	configured ()
	Check if the device is configured. More...

void	sof_enable ()
	Enable the start of frame interrupt. More...

void	sof_disable ()
	Disable the start of frame interrupt. More...

bool	endpoint_add (usb_ep_t endpoint, uint32_t max_packet, usb_ep_type_t type, mbed::Callback< void()> callback=nullptr)
	Add an endpoint. More...

template<typename T >
bool	endpoint_add (usb_ep_t endpoint, uint32_t max_packet, usb_ep_type_t type, void(T::*callback)())
	Add an endpoint. More...

void	endpoint_remove (usb_ep_t endpoint)
	Remove an endpoint. More...

void	endpoint_remove_all ()
	Remove all non-zero endpoints. More...

void	endpoint_stall (usb_ep_t endpoint)
	Stall an endpoint. More...

void	endpoint_unstall (usb_ep_t endpoint)
	Un-stall an endpoint. More...

uint32_t	endpoint_max_packet_size (usb_ep_t endpoint)
	Get the current maximum size for this endpoint. More...

void	endpoint_abort (usb_ep_t endpoint)
	Abort the current transfer on this endpoint. More...

bool	read_start (usb_ep_t endpoint, uint8_t *buffer, uint32_t size)
	start a read on the given endpoint More...

uint32_t	read_finish (usb_ep_t endpoint)
	Get the status of a read. More...

bool	write_start (usb_ep_t endpoint, uint8_t *buffer, uint32_t size)
	Write a data to the given endpoint. More...

uint32_t	write_finish (usb_ep_t endpoint)
	Get the status of a write. More...

Protected Member Functions
virtual void	callback_power (bool powered)
	Called by USBDevice layer on power state change. More...

virtual void	callback_sof (int frame_number)
	Called by USBDevice layer on each new USB frame. More...

virtual void	callback_reset ()
	Called by USBDevice layer on bus reset. More...

void	complete_request (RequestResult result, uint8_t *data=NULL, uint32_t size=0)
	Called to complete the setup stage of a callback request. More...

void	complete_request_xfer_done (bool success)
	Called to complete the data stage of a callback request. More...

void	complete_set_configuration (bool success)
	Called to complete a set configuration command. More...

void	complete_set_interface (bool success)
	Called to complete a set interface command. More...

uint8_t *	find_descriptor (uint8_t descriptor_type, uint8_t index=0)
	Find a descriptor type inside the configuration descriptor. More...

const usb_ep_table_t *	endpoint_table ()
	Get the endpoint table of this device. More...

virtual void	start_process ()
	Callback called to indicate the USB processing needs to be done. More...

virtual void	lock ()
	Acquire exclusive access to this instance USBDevice. More...

virtual void	unlock ()
	Release exclusive access to this instance USBDevice. More...

virtual void	assert_locked ()
	Assert that the current thread of execution holds the lock. More...

Detailed Description

USBMSD class: generic class in order to use all kinds of blocks storage chip.

Introduction

USBMSD implements the MSD protocol. It permits to access a block device (flash, SD Card,...) from a computer over USB.

#include "mbed.h"
#include "SDBlockDevice.h"
#include "USBMSD.h"
SDBlockDevice sd(PTE3, PTE1, PTE2, PTE4);
USBMSD usb(&sd);
int main() {
    while(true) {
        usb.process();
    }
    return 0;
}

Definition at line 64 of file USBMSD.h.

Constructor & Destructor Documentation

USBMSD	(	BlockDevice *	bd,
		bool	connect_blocking = `true`,
		uint16_t	vendor_id = `0x0703`,
		uint16_t	product_id = `0x0104`,
		uint16_t	product_release = `0x0001`
	)

Constructor.

This creates a new USBMSD object with the given block device. Connect must be called for the block device to connect.

Parameters

bd	BlockDevice to mount as a USB drive
connect_blocking	true to perform a blocking connect, false to start in a disconnected state
vendor_id	Your vendor_id
product_id	Your product_id
product_release	Your preoduct_release

USBMSD	(	USBPhy *	phy,
		BlockDevice *	bd,
		uint16_t	vendor_id,
		uint16_t	product_id,
		uint16_t	product_release
	)

Fully featured constructor.

Construct this object with the supplied USBPhy and parameters. The user this object is responsible for calling connect() or init().

Note: Derived classes must use this constructor and call init() or connect() themselves. Derived classes should also call deinit() in their destructor. This ensures that no interrupts can occur when the object is partially constructed or destroyed.

Parameters

phy	USB phy to use
bd	BlockDevice to mount as a USB drive
vendor_id	Your vendor_id
product_id	Your product_id
product_release	Your preoduct_release

virtual ~USBMSD ( )

virtual

Destroy this object.

Any classes which inherit from this class must call disconnect before this destructor runs.

Member Function Documentation

virtual void assert_locked ( )

protectedvirtualinherited

Assert that the current thread of execution holds the lock.

void attach ( mbed::Callback< void()> cb )

Called when USBMSD needs to perform processing.

Parameters

cb	Callback called when USBMSD needs process() to be called

virtual void callback_power ( bool powered )

protectedvirtualinherited

Called by USBDevice layer on power state change.

Parameters

powered true if device is powered, false otherwise

Warning: Called in ISR context

Definition at line 342 of file USBDevice.h.

virtual void callback_reset ( )

protectedvirtualinherited

Called by USBDevice layer on bus reset.

complete_reset must be called after the device is fully reset.

Warning: Called in ISR context

Reimplemented in USBCDC_ECM, USBCDC, and USBTester.

Definition at line 370 of file USBDevice.h.

virtual void callback_sof ( int frame_number )

protectedvirtualinherited

Called by USBDevice layer on each new USB frame.

Callbacks are enabled and disabled by calling sof_enable and sof_disable.

Parameters

frame_number The current frame number

Warning: Called in ISR context

Definition at line 357 of file USBDevice.h.

void complete_request	(	RequestResult	result,
		uint8_t *	data = `NULL`,
		uint32_t	size = `0`
	)

protectedinherited

Called to complete the setup stage of a callback request.

Possible options that can be passed as a result are:

Receive - Start the data OUT phase of this control transfer
Send - Start the data IN phase of this control transfer
Success - Operation was a success so start the status phase
Failure - Operation failed or is unsupported so send a stall
PassThrough - Pass on the request for standard processing

Parameters

result	The result of the setup phase.
data	Buffer to send or receive if the result is Send or Receive
size	Size to transfer if the result is Send or Receive

void complete_request_xfer_done ( bool success )

protectedinherited

Called to complete the data stage of a callback request.

Parameters

success true if the operation was successful, false otherwise

void complete_set_configuration ( bool success )

protectedinherited

Called to complete a set configuration command.

Parameters

success true if the configuration was set, false otherwise

void complete_set_interface ( bool success )

protectedinherited

Called to complete a set interface command.

Parameters

success true if the interface was set, false otherwise

bool configured ( )

inherited

Check if the device is configured.

Returns: true if configured, false otherwise

bool connect ( )

Connect the USB MSD device.

Returns: true if successful

void deinit ( )

inherited

Power down this instance.

Disable interrupts and stop sending events. This method can be used for temporary power-saving; This call can allow USB to be temporarily disabled to permit power saving. However, it is up to the user to make sure all the transfers have concluded (for example when USB power is lost). USBDevice::connect can be used to resume USB operation.

void disconnect ( )

Disconnect the USB MSD device.

void endpoint_abort ( usb_ep_t endpoint )

inherited

Abort the current transfer on this endpoint.

Parameters

endpoint endpoint with transfer to abort

Note: This endpoint must already have been setup with endpoint_add

bool endpoint_add	(	usb_ep_t	endpoint,
		uint32_t	max_packet,
		usb_ep_type_t	type,
		mbed::Callback< void()>	callback = `nullptr`
	)

inherited

Add an endpoint.

Parameters

endpoint	Endpoint to enable
max_packet	Maximum size of a packet which can be sent or received on this endpoint
type	Endpoint type - USB_EP_TYPE_BULK, USB_EP_TYPE_INT or USB_EP_TYPE_ISO
callback	Method pointer to be called when a packet is transferred

Returns: true if successful, false otherwise

bool endpoint_add	(	usb_ep_t	endpoint,
		uint32_t	max_packet,
		usb_ep_type_t	type,
		void(T::*)()	callback
	)

inherited

Add an endpoint.

Parameters

endpoint	Endpoint to enable
max_packet	Maximum size of a packet which can be sent or received on this endpoint
type	Endpoint type - USB_EP_TYPE_BULK, USB_EP_TYPE_INT or USB_EP_TYPE_ISO
callback	Method pointer to be called when a packet is transferred

Returns: true if successful, false otherwise

Definition at line 162 of file USBDevice.h.

uint32_t endpoint_max_packet_size ( usb_ep_t endpoint )

inherited

Get the current maximum size for this endpoint.

Return the currently configured maximum packet size, wMaxPacketSize, for this endpoint.

Note: This endpoint must already have been setup with endpoint_add

void endpoint_remove ( usb_ep_t endpoint )

inherited

Remove an endpoint.

Parameters

endpoint Endpoint to disable

Note: This endpoint must already have been setup with endpoint_add

void endpoint_remove_all ( )

inherited

Remove all non-zero endpoints.

void endpoint_stall ( usb_ep_t endpoint )

inherited

Stall an endpoint.

If there is an ongoing transfer on this endpoint then it will be aborted.

Parameters

endpoint Endpoint to stall

Note: You cannot stall endpoint 0 with this function; This endpoint must already have been setup with endpoint_add

const usb_ep_table_t* endpoint_table ( )

protectedinherited

Get the endpoint table of this device.

Returns: Endpoint table of the USBPhy attached to this USBDevice

void endpoint_unstall ( usb_ep_t endpoint )

inherited

Un-stall an endpoint.

Un-stalling an endpoint resets data toggle back to DATA0. Additionally, if there is an ongoing transfer on this endpoint it will be aborted.

Parameters

endpoint Endpoint to un-stall

Note: This endpoint must already have been setup with endpoint_add

uint8_t* find_descriptor	(	uint8_t	descriptor_type,
		uint8_t	index = `0`
	)

protectedinherited

Find a descriptor type inside the configuration descriptor.

Parameters

descriptor_type	Type of descriptor to find
index	Configuration descriptor index ( 0 if only one configuration present )

Returns: A descriptor of the given type or NULL if none were found

void init ( )

inherited

Initialize this instance.

This function must be called before calling any other functions of this class, unless specifically

virtual void lock ( )

protectedvirtualinherited

Acquire exclusive access to this instance USBDevice.

bool media_removed ( )

Check if MSD device was removed/unmounted on the host side.

Returns: true if device was removed/unmounted on the host side

void process ( )

Perform USB processing.

uint32_t read_finish ( usb_ep_t endpoint )

inherited

Get the status of a read.

Parameters

endpoint endpoint to get the status of

Returns: number of bytes read by this endpoint

bool read_start	(	usb_ep_t	endpoint,
		uint8_t *	buffer,
		uint32_t	size
	)

inherited

start a read on the given endpoint

Start a read on the given endpoint. The data buffer must remain unchanged until the transfer either completes or is aborted.

Parameters

endpoint	endpoint to read data from
buffer	buffer to fill with read data
size	The size of data to read. This must be greater than or equal to the max packet size for this endpoint

Returns: true if the read was completed, otherwise false

Note: This endpoint must already have been setup with endpoint_add

void sof_disable ( )

inherited

Disable the start of frame interrupt.

Stop calling USBDevice::callback_sof.

void sof_enable ( )

inherited

Enable the start of frame interrupt.

Call USBDevice::callback_sof on every frame.

virtual void start_process ( )

protectedvirtualinherited

Callback called to indicate the USB processing needs to be done.

Implements USBPhyEvents.

virtual void unlock ( )

protectedvirtualinherited

Release exclusive access to this instance USBDevice.

uint32_t write_finish ( usb_ep_t endpoint )

inherited

Get the status of a write.

Parameters

endpoint endpoint to get the status of

Returns: number of bytes sent by this endpoint

bool write_start	(	usb_ep_t	endpoint,
		uint8_t *	buffer,
		uint32_t	size
	)

inherited

Write a data to the given endpoint.

Write data to an endpoint. The data sent must remain unchanged until the transfer either completes or is aborted.

Parameters

endpoint	endpoint to write data to
buffer	data to write
size	the size of data to send. This must be less than or equal to the max packet size of this endpoint

Note: This endpoint must already have been setup with endpoint_add

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Important Information for this Arm website